fix(nuxt): use consistent annotations for tree-shaking

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I believe since we initially added these comments, the syntax has changed (in latest rollup). Without this change we get warnings like this:

"/*#__PURE__*/"

in "test/fixtures/basic/pages/with-computed-layout.vue" contains an annotation that Rollup cannot interpret due to the position of the comment. The comment will be removed to avoid issues.
test/fixtures/basic/pages/with-dynamic-layout.vue (14:1) Error when using sourcemap for reporting an error: Can't resolve original location of error.
test/fixtures/basic/pages/with-dynamic-layout.vue (14:1) A comment

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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  Partials        ?        0           

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